Perforating attachment for printing presses



Feb. 22 1927.

' P. HEMBERGER. PERFORATING ATTACHMENT FOR PRINTING PRESSES Filed Feb. 1926 PETER Hembevrger INVENTOR 4 ATTORNEY. Y

Patented Feb. 22, 1927.

' PETER HEMBEBGER, or zrnnsnv CITY, 'ivnw i RsEY.

' rnnronarme ATTACHMENT m. rninrinernnssns.

Application nee February 17, 1925. Serial No. 88,712.

This invention relates to improvements 'in a device for cutting and perforating sheets of paper and has reference to sucha device in the form of an attachment for machines of the cylinder type.

Pe'rforating'devices of this character are employed to impresslines on sheets of paper for the purpose of facilitating the division of such sheets upon the impressed line. In connection with printing machines of the cylinder type, this Work has heretofore printing .been performed by perforating or cutting the paper on the impression cylinder by means of a disc having a serrated periphery provided With either a sharp cutting or a blunt punching edge Working against the backing of soft material on the face of the cylinder. A sheet of paper to be printed and PBI'fOI'ELtBCl'lS fed into the press Where it is gripped along one'edge by fingers carried by and operating on the cylinder. Itotary movement of the impression cylinder causes the paper to Wrap about its surface over the backing material between the latter and the surface of a printing roller or plate. Preferably at a point in its travel with the cylinder Where the paper is released the perforating discs are arranged to operate 7 on the paper. It Will be clear from the brief description above, that the perforating disc Working against the backing materlal on the cylinder Will, after a small run,

. cut into the backing and render it unusable the'backing of the ment of" the cylinder.

as a backing. of the present perforating devices it may be necessary during a long run to change the backing on the cylinder a'great number of times. The time consumed to change the backing results in considerable loss and naturally delays output. l

With the foregoing in mind it is the purpose of the present invention to provide an v attachment for a cylinder printing press, which may be used for perforating or cuttingthe sheets of paper fed in the impression cylinder Without in any Way damaging latter or interrupting the operation of the press. I accomplish this purpose by means of an attachment comprising a serrated cutting edge applicable to the surface of the impression cylinder and yieldable means for holding the paper against the cutting edge during rotary move- One embodiment of my invention is illustra-tively exemplified in the, accompany- Therefore, as a consequence knife is serrated to bent at an angle to form rotary impression cylinder of a printing press, and 11 a fixed rod clisposed-'beyond the periphery of the cylinder, theaxis of the 'rod being parallel tothat of the cylinder.

Carried'on the surface of the cylinder 10 in the'usual manner is a pad or backing 12, composed of sheets of ;soft material such as paper or felt "for example. It Will be clear that cylinders of this type are provided with suitable mechanismfor edges of the sheets of paper beingfed to the press,

the] invention have been omitted from the drawing. The printing trated diagrammatically in Figure 1 and is adapted to move With the surface of the cylinder in the usual manner.

A fter'the cylinder 10 has beenproperly set up with the necessary backing 12, I propose to superimpose'on the surface of the packing one or more perforating or cutting knives 13. Eacl knife comprises a length of flexible tool steelh'aving its mid portion 14 substantially triangular in cross section.

One'side of the knifethen While the apex of the form a perforatingedge 16, as illustrated in Figure 3 or sharpened ofthe' packing 12,

One end of the knife 13 is a hook portion 17 thejedge of the eylin Figure 4c.

adapted to hook over? 1nder,-the' opposite end at an angle to the triangular portion thereof so that When the knife is superimposed on but for the purposes of illustrating the present invention, details not specific to gripping the p p plate 10- is illus- I becomes the base 15 which is held in contact with the surface to provide 'a' cutting edge 16 as illustrated 18 of the knife be h i -1g round and threaded to accommodate a plate 19 loosely carried thereby and adjust the cylinder the la-tter 'end Willproject in- Wardly and below the periphery. The plate 19 is provided With two spaced openings 21 which receive the opposite ends of a bent Wire hook 22; This hook 22 vissubstantially- I so U-shaped, one angle thereof being adapted to embrace a rod 23 arranged vvlthln the cyl- 'inder 10 between the opposite end walls. It will be clear that having engaged the hook tobe printed with the impression cylinder '10,- the paper will rest over the perforating or cutting edge16-16 and in order to exert sufiicient pressure on the paper to cause the 7 edge 1616 to penetrate the paper I provide of the spring 30.

a fibre roller 24 which yieldably engages the paper against the edge of'the knife. The roller 24 is rotatably mounted between the "forked end 25 of a pivoted arm 26, the pivoted end thereof being carried by a link conne ction 27 mounted on a block 28. The pivoted connection between the arm 26 and link 27 is normally on an elevation below a cen- .ter line drawn between the fixed pivot 29 of'the link 27 and the axis of the roller 24. A coiled spring 30, supported at one end in a bracket31 arranged on the block 28 and yieldably [pressing outwardly against the mid portion of the arm 26, tends to push the roller 24 in the direction of the surface of the. cylinder and consequently engages the paper against the knife edge 16-16 of the knife.

In order to adjust the roller 24 with respect to the cylinder 10, and consequently limit the distance the roller may approach the surface of the cylinder, the arm 26 is provided with a notch 32 disposed just beyond the pivotal connection of thearm and link 27 and adapted to function as a shoulder against which ashoe 33 is arranged. The shoe 33 is loosely carried at the free end of a rod 34 which is rotatably supported in a groove 35 along one edge of the block 28, the rod being held in the groove by means of a strap 36 embracing the rod and attached to the block. The'opposite end of the rod 34 is threaded and is adjustable in a threaded opening of a bracket 37 attached to the block 28. To facilitate adjustment of the rod 34 by rotary movement thereof the that as the shoe 33 is adjusted towards the arm 26, pressure against the shoulder of a notch 32 will cause the arm to swing away from the cylinder and against the tension The block 28 is preferably a split member having a bore projecting in a direction parallel to the axis of the roller 24, the bore being arrangedto receive the'fixed rod 11 of the press. Adjustment to tighten screws 39 of the thumb Wheel 38, rod

in the split portions of the block 20 will tend to set the attachment rigidlyon the rod 11 and in desired position with respect to the cylinder.

In operation, the desired position of the line of perforations is ascertained then the hook 17 of the knife 13 is placed over one edge of the impression surface of the cylinder 10 and the other hook 22 is engagedover the rod 23. The knife 13 is thereafter adjusted longitudinally of the cylinder to its correct position and the nut 20 tightened to cause the knife to closely embrace the sur face of the cylinder on top of the backing. The block 28 is then adjusted over rod 11. until the roller 24 coincides with the path of travel of the knife 13. As a final operation the position of the roller with respect to the knife 13 is determined by adjustment It will be clear that according to the present invention, paper disposed over the knife 13 will be cut or perforated but Without in any Way damaging the surface of the backing which is never touched by the cutting edge of the knife, as practiced in perforating attachments now in use.

VZhat I claim as new and desire to secure by Letters Patent is 1. In combination, an'impression cylinder for a printing press, means attachable to said cylinder to impress a line in a sheet of paper carried by the cylinder, and a roller platen for holding the paper in contact with said first means. i I I 2. In combination, an impression cylinder for a printing press, a knife attachable to said cylinder, and a yieldable roller platen in the path of said knife forholding a sheet, of paper in contact with the knife.

3. In combination, an impression cylinder for a printing press, a flexible knife adapted to embrace said cylinder, and a yieldably supported roller arranged to operate in the path of saidknife and against the paper being carried by the cylinder, to

V lmpress a line in the paper for the purpose of facilitating the division thereof upon the impressed line.

4. A device for impressing a line in paper for the purpose of facilitating the division thereof upon the impressed line, comprising a knife adjustable on a rotary cylindrical support, and a yieldably supported member adjustable with respect to the longi- .of the cylindrical support, apivoted arm 34 and shoe 33.

carried by said block, a spring to support the arm in the direction of the cylindrical support, and a roller carried at the free end tachment of the character described, comprising a length of flexible tool steel rod,

the latter having its mid portion substan-- tially triangular in cross section, one side of the rod forming the base and the apex being serrated to form a cutting edge. 1 p

7 A cutting tool, as claimed in claim 6, in Whichone end of the rod is bent .to form a hook and'the opposite is threaded, fastening means disposed over the latter end, and means adjustable on the threaded end to engage the first meansand adjust the same.

8. In combination, a printing press having a rotary impression'cylinder, a fixed member disposed axially and outside the cylinder, backing for said cylinder against Which the paper to be printed is. carried by the cylinder, and avperforatin'g attachment for the press, comprising, a flexible knife provided with hook ends to engage the ends of the impression surface of the cylinder, I

means for adjusting the knife in superimposed position on said backing, a block arranged on the fixed imember of the press, and an adjustableyieldably supported roller carried by the block and operating in the path of the knife to impress the paper over the'latter during rotary movement with the cylinder. 7

In testimony whereof I'aflix my signature.

PETER HEMBERGER. 

